Question

answer is 7/4
class 10​

Answer 1

f(x) = 2x² +px - 15 = 0

As 2 is a root of the equation

f(2) =0

Substitute x for 2

Then you will get p as 7

Next equation has equal roots

Therefore D= 0

now we have p= 7

So the equation we have now is 7x²+7x+k=0

D=b²-4ac

D=0

49-28k=0

Calculating

K = 7/4